I have the same problem with mine. the power lead has a plug on the end so there should be a plug socket close by. the lead will come out the wall somewhere, it's sunk into the wall so you don't see it dangling! Mine is on the top of the adjacent wall unit. I think it's a 3a fuse for the plug. I also found the switched spur which supplies the plug socket, and i changed the fuse in this also, but it still doesn't work. I think it is the pcb unit at fault, which is basically the 4 buttons you see on the front. I have found the part avail for £28.01 online. It needs soldering to fit it. Hope it's just the fuse though, get out your stepladders!!!
evvo, January 2010